US4011003A - Electromagnetically controllable pivoting mirror device - Google Patents
Electromagnetically controllable pivoting mirror device Download PDFInfo
- Publication number
- US4011003A US4011003A US05/652,535 US65253576A US4011003A US 4011003 A US4011003 A US 4011003A US 65253576 A US65253576 A US 65253576A US 4011003 A US4011003 A US 4011003A
- Authority
- US
- United States
- Prior art keywords
- mirror
- reflecting surface
- frame
- pivoting
- disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1821—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
An electromagnetically controllable pivoting device for pivoting a reflecting surface of a pivoting mirror about pivotal axes parallel to said surface with the aid of electrical control signals, more particularly intended for a video disc player in which a light beam is produced by means of a light source, which beam is aimed at an information track of a rotating optically readable video disc by means of the reflecting surface of the pivoting mirror. The mirror is supported by a bellows body of an elastically deformable plastic, which bellows body is provided with at least one rotation-symmetrical fold which is concentric with the optical center of the reflecting surface.
Description
The invention relates to an electromagnetically controllable pivoting mirror device for causing a reflecting surface to pivot about pivotal axes parallel to the reflecting surface under the influence of electrical control signals, more particularly destined for both radially and tangentially following the information track of a rotating optically readable video disc with the aid of a light spot produced by a light source, and comprising a frame, a mirror which relative to the frame is pivotable about the said pivotal axes, which mirror comprises a base with a reflecting surface on one side thereof, supporting means for pivotably supporting the mirror on the frame and comprising a first portion which is connected to the mirror and a second portion which is connected to the frame, as well as a third elastically deformable intermediate portion of an elastic plastic, and electromagnetic control means comprising permanent magnets and/or electrical coils.
Swiss Pat. Specification No. 354,117 describes a pivoting mirror device in which the mirror comprises a permanent-magnetic body on which a reflecting layer is deposited. Thus, the base of the mirror also constitutes one of the electromagnetic control means, namely the permanent magnetic part thereof which is connected to the mirror. The base is rendered pivotable by embedding it in a rubber-like compound which is located between the pole-pieces of a U-shaped yoke on which a control coil is mounted. By energizing the coil the mirror is subjected to a torque so that it performs a pivoting movement in the elastic material in which it is embedded. It is alternatively possible to mount the mirror in a rubber-like compound which is located in a space between the pole-pieces of two mutually perpendicular yokes which are each provided with an associated control coil, so that the reflecting surface can pivot about two mutually perpendicular axes.
The known mirror was intended for use in television receivers of the type in which a light beam instead of an electron beam is controlled. In view of the application pursued, in particular with respect to the dimensions of television tubes at that time, only a slight movability of the mirror was required, so that completely embedding the mirror leaving the reflecting surface free presented a satisfactory solution for the object in view. In recent years there has been a substantial revival of the interest in pivoting mirror devices in view of applications in video disc players. At present video disc players are being developed, which enable video information contained on a rotary disc to be read by means of a light beam, for example a laser beam which is aimed at the disc with the aid of optical means, which means include a pivoting mirror device, for accurately following and reading the tracks on the disc, see for example the articles "The Philips VLP System," Philips Technical Review 33, 178-193, 1973, No. 7; "Ein neues Bildplattensystem mit transparanter Folie," Funkschau, Heft 20, 2286 - 2288, 1974, and "The MCA Disco-Vision System," Journal of the SMPTE, volume 83, July 1974. For applications in such video disc players the pivoting mirror device should comply with other requirements than that which is described in the afore-mentioned Swiss Patent Specification. In particular, a substantially greater movability of the mirror is required, i.e. using a comparatively low power a comparatively large deflection of the pivoting mirror should be obtainable at a comparatively low frequency. The pivoting mirror device is included in an automatic control system, which serves for following the tracks on the video disc with the read beam. The speed of revolution of of the video disc is 1500 or 1800 revolutions per minute, depending on the mains frequency which may be 50 or 60 Hz, respectively. For following the track the pivoting mirror device must be capable of following an oscillation of the track with an amplitude of 200μ at an oscillating frequency of 25 Hz.
It is an object of the invention to provide a pivoting mirror device which is specifically suitable for use in video disc players and the invention is characterized in that said third portion of the supporting means comprises a substantially rotation-symmetrical bellows body which comprises at least one fold which is concentric with the optical centre of the reflecting surface. Thus, in the pivoting mirror device in accordance with the invention the pivoting mirror is supported by an elastically deformable body, to be referred to as bellows hereinafter. The bellows required for supporting the mirror can be manufactured entirely by simple state-of-the-art methods from a suitable elastic, for example, rubber-like, plastic. Such a component is highly insensitive to external mechanical influences and moreover has the property of resuming its original shape in the absence of external forces. Thus, the invention provides a pivoting mirror device which can be both sensitive and mechanically highly robust, and which moreover requires no separate means for returning and keeping the mirror in the neutral position in the absence of driving torques.
An embodiment of the invention in which the bellows consist of one unit is characterized in that said first portion, which is connected to the mirror, comprises a substantially disc-shaped body, the second portion which is connected to the frame substantially consists of a ring which is concentric with the disc but which is axially shifted relative thereto, and the third portion comprises a cylindrical casing which at its one side adjoins the ring and at its other side via the concentric fold(s) adjoins the substantially disc-shaped body. Such a shape of the bellows is favourable for reasons of manufacturing technology and, moreover provides sufficient space to allow the coils to be arranged adjacent the mirror.
The invention will be described in more detail with reference to the drawing, in which:
FIG. 1 is a perspective side view, for a quarter part in cross-section, of a pivoting mirror device in accordance with the invention in cylindrical form, and
FIG. 2 is a plan view of the pivoting mirror device in accordance with FIG. 1m a cover at the top being removed for the sake of clarity.
The pivoting mirror device in accordance with the Figures comprises a frame 1, which is substantially cylindrical and which has a closed flange-shaped base, by means of which it can be mounted in a video disc player in a suitable manner. On this frame a pivoting mirror 2 is mounted which comprises a ceramic base 3 on which an extremely thin reflecting layer 4 is deposited. The mirror is pivotable about every axis perpendicular to the neutral optical axis 5. This is the centre line of the cylindrical frame 1. In the absence of control voltages the centre line is perpendicular to the reflecting surface 4 of the mirror 2 and extends through the centre thereof.
The pivoting mirror is pivotably supported relative to the frame 1 by means of the elastically deformable bellows 6. These bellows comprise a first portion 7, which is connected to the mirror, as well as a portion 8, which is connected to the frame. These two portions are interconnected by means of an elastically deformable intermediate portion of an elastic plastic, which portion consists of a substantially rotation-symmetrical bellows body 9, which comprises a fold 10 which is concentric with the axis 5.
At the circumference of the mirror 2 four permanent magnets 11 are glued. In the Figures the various magnets are distinguished from each other by means of accents. For the sake of simplicity the accents are omitted in the description in the case that mutually identical components are discussed in general. The permenent magnets 11 each co-operate with an associated control coil 12. Each of the control coils is connected to the electronic control circuit which includes the pivoting mirror device by means of two coil terminations 13.
The bellows 6 are integrally manufactured from a suitable elastic, for example rubber-like, plastic. The portion 7 which is connected to the mirror 2 takes the form of a disc-shaped body onto which the mirror can simply be glued. The bellows are connected to the frame 1 by means of the annular flange 8 which is concentrically disposed on a raised portion 14 in the centre of the frame. Also in this case fixation may be effected by glueing. The ring 8 is axially shifted relative to the disc 7 and is connected to the disc via the cylindrical portion of the bellows body 9 which via the fold 10 adjoins the disc 7.
In the embodiment shown an enclosed space is located at the inside of the bellows 6. Such an enclosed space may be desirable so as to increase the rigidity of the device against forces in the direction of the axis 5. However, in other embodiments it is alternatively possible to make the chamber communicate with the surrounding atmosphere by means of openings. This has the advantage that barometric variations have no effect on the axial position of the reflecting surface 4.
Claims (2)
1. An electromagnetically controllable pivoting mirror device for causing a reflecting surface to pivot about pivotal axes parallel to the reflecting surface under the influence of electrical control signals, more particularly destined for both radially and tangentially following the information track of a rotating optically readable video disc with the aid of a light spot produced by a light source, and comprising:
a frame,
a mirror which relative to the frame is pivotable about the said pivotal axes, which mirror comprises a base with a reflecting surface on one side thereof,
supporting means for pivotably supporting the mirror on the frame and comprising a first portion which is connected to the mirror and a second portion which is connected to the frame as well as a third elastically deformable intermediate portion of an elastic plastic, and
electromagnetic control means comprising permanent magnets and/or electrical coils, characterized in that said third portion of the supporting means comprises a substantially rotation-symmetrical bellows body, which comprises at least one fold which is concentric with the optical center of the reflecting surface.
2. A pivoting mirror device as claimed in claim 1, with a supporting means which is integrally manufactured from an elastic plastic, characterized in that
said first portion, which is connected to the mirror, comprises a substantially disc-shaped body,
the second portion, which is connected to the frame, substantially comprises a ring which is concentric with the disc, but which is axially shifted relative thereto, and
the third portion comprises a cylindrical casing which at its one side adjoins the ring and at its other side via the concentric fold(s) adjoins the substantially disc-shaped body.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7511634 | 1975-03-10 | ||
NL7511634A NL7511634A (en) | 1975-10-03 | 1975-10-03 | ELECTROMAGNETICALLY CONTROLLED SWIVEL MIRROR DEVICE. |
Publications (1)
Publication Number | Publication Date |
---|---|
US4011003A true US4011003A (en) | 1977-03-08 |
Family
ID=19824579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/652,535 Expired - Lifetime US4011003A (en) | 1975-03-10 | 1976-01-26 | Electromagnetically controllable pivoting mirror device |
Country Status (13)
Country | Link |
---|---|
US (1) | US4011003A (en) |
AT (1) | AT346405B (en) |
AU (1) | AU496933B2 (en) |
CH (1) | CH611719A5 (en) |
DE (1) | DE2643581A1 (en) |
DK (1) | DK140194B (en) |
ES (1) | ES452034A1 (en) |
FR (1) | FR2326716A1 (en) |
GB (1) | GB1558810A (en) |
IT (1) | IT1072943B (en) |
NL (1) | NL7511634A (en) |
NO (1) | NO763341L (en) |
SE (1) | SE407295B (en) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4056760A (en) * | 1973-02-19 | 1977-11-01 | Ernst Leitz G.M.B.H. | Method of driving a two coordinate oscillator and circuit arrangement therefor |
US4100576A (en) * | 1976-04-28 | 1978-07-11 | Zenith Radio Corporation | Electromagnetic optical beam controller having an eddy current damper for arresting mechanical resonance |
US4129930A (en) * | 1977-01-13 | 1978-12-19 | U.S. Philips Corporation | Method of manufacturing an electrically controllable pivoting mirror device |
US4135206A (en) * | 1977-03-25 | 1979-01-16 | U.S. Philips Corporation | Objective mount for video disc player |
FR2396323A1 (en) * | 1977-06-30 | 1979-01-26 | Ricoh Kk | ROTATING MIRROR DEVICE, ESPECIALLY FOR REPROGRAPHY EQUIPMENT |
US4269486A (en) * | 1979-01-09 | 1981-05-26 | Sony Corporation | Multi-axis movable mirror device |
US4302830A (en) * | 1978-05-10 | 1981-11-24 | Olympus Optical Company Ltd. | Optical information reading-out apparatus |
US4371782A (en) * | 1979-12-31 | 1983-02-01 | Frans Brouwer | Optical pattern tracing system with remotely controlled kerf and forward offsets |
US4488789A (en) * | 1981-12-21 | 1984-12-18 | North American Philips Corporation | Electromagnetically deflectable device |
US4592037A (en) * | 1980-11-28 | 1986-05-27 | Hitachi, Ltd. | Device for displacing a pickup head in multi-axial directions |
US4719614A (en) * | 1983-05-20 | 1988-01-12 | Thomson-Csf | Optical recording-reading head using an adjustable mount for pivoting mirror |
US4847726A (en) * | 1987-12-14 | 1989-07-11 | Eastman Kodak Company | Magnetic actuator |
US4890129A (en) * | 1987-12-14 | 1989-12-26 | Eastman Kodak Company | Exposure control device |
US5105297A (en) * | 1989-08-08 | 1992-04-14 | Eastman Kodak Company | Mount for an optical element |
US5136558A (en) * | 1989-06-20 | 1992-08-04 | Applied Magnetics Corporation | Two axis electromagnetic actuator |
US5291473A (en) * | 1990-06-06 | 1994-03-01 | Texas Instruments Incorporated | Optical storage media light beam positioning system |
US5491680A (en) * | 1990-06-06 | 1996-02-13 | Texas Instruments Incorporated | Optical tracking system for positioning a beam of light |
US20070165312A1 (en) * | 2004-07-30 | 2007-07-19 | Sony Corporation | Deformable mirror device, deformable mirror plate |
CN110244429A (en) * | 2019-06-01 | 2019-09-17 | 瑞声科技(新加坡)有限公司 | A kind of prism apparatus and periscope type lens mould group applied to periscope type lens mould group |
CN110275271A (en) * | 2019-07-15 | 2019-09-24 | 北京遥感设备研究所 | A kind of connection structure of reflecting mirror and shaft |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1162281A (en) * | 1979-09-12 | 1984-02-14 | Thomas J. Hutchings | Controllable mirror |
GB2344188A (en) * | 1998-11-26 | 2000-05-31 | Marconi Electronic Syst Ltd | Force decoupler system for mirror on flexible mount |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH354117A (en) * | 1957-09-25 | 1961-05-15 | Philips Ag | Device for swiveling at least one reflective surface according to at least one electrical variable |
GB1393896A (en) * | 1971-07-22 | 1975-05-14 | Vickers Ltd | Optical deflecting devices |
-
1975
- 1975-10-03 NL NL7511634A patent/NL7511634A/en not_active Application Discontinuation
-
1976
- 1976-01-26 US US05/652,535 patent/US4011003A/en not_active Expired - Lifetime
- 1976-09-28 DE DE19762643581 patent/DE2643581A1/en not_active Withdrawn
- 1976-09-30 SE SE7610811A patent/SE407295B/en unknown
- 1976-09-30 CH CH1240076A patent/CH611719A5/xx not_active IP Right Cessation
- 1976-09-30 NO NO763341A patent/NO763341L/no unknown
- 1976-09-30 DK DK441076AA patent/DK140194B/en unknown
- 1976-09-30 IT IT27884/76A patent/IT1072943B/en active
- 1976-09-30 GB GB40630/76A patent/GB1558810A/en not_active Expired
- 1976-10-01 AT AT730676A patent/AT346405B/en not_active IP Right Cessation
- 1976-10-01 ES ES452034A patent/ES452034A1/en not_active Expired
- 1976-10-01 AU AU18313/76A patent/AU496933B2/en not_active Expired
- 1976-10-01 FR FR7629587A patent/FR2326716A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH354117A (en) * | 1957-09-25 | 1961-05-15 | Philips Ag | Device for swiveling at least one reflective surface according to at least one electrical variable |
GB1393896A (en) * | 1971-07-22 | 1975-05-14 | Vickers Ltd | Optical deflecting devices |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4056760A (en) * | 1973-02-19 | 1977-11-01 | Ernst Leitz G.M.B.H. | Method of driving a two coordinate oscillator and circuit arrangement therefor |
US4100576A (en) * | 1976-04-28 | 1978-07-11 | Zenith Radio Corporation | Electromagnetic optical beam controller having an eddy current damper for arresting mechanical resonance |
US4129930A (en) * | 1977-01-13 | 1978-12-19 | U.S. Philips Corporation | Method of manufacturing an electrically controllable pivoting mirror device |
US4135206A (en) * | 1977-03-25 | 1979-01-16 | U.S. Philips Corporation | Objective mount for video disc player |
FR2396323A1 (en) * | 1977-06-30 | 1979-01-26 | Ricoh Kk | ROTATING MIRROR DEVICE, ESPECIALLY FOR REPROGRAPHY EQUIPMENT |
US4186991A (en) * | 1977-06-30 | 1980-02-05 | Ricoh Co., Ltd. | Angularly rotatable mirror apparatus |
US4302830A (en) * | 1978-05-10 | 1981-11-24 | Olympus Optical Company Ltd. | Optical information reading-out apparatus |
US4269486A (en) * | 1979-01-09 | 1981-05-26 | Sony Corporation | Multi-axis movable mirror device |
US4371782A (en) * | 1979-12-31 | 1983-02-01 | Frans Brouwer | Optical pattern tracing system with remotely controlled kerf and forward offsets |
US4592037A (en) * | 1980-11-28 | 1986-05-27 | Hitachi, Ltd. | Device for displacing a pickup head in multi-axial directions |
US4488789A (en) * | 1981-12-21 | 1984-12-18 | North American Philips Corporation | Electromagnetically deflectable device |
US4719614A (en) * | 1983-05-20 | 1988-01-12 | Thomson-Csf | Optical recording-reading head using an adjustable mount for pivoting mirror |
US4847726A (en) * | 1987-12-14 | 1989-07-11 | Eastman Kodak Company | Magnetic actuator |
US4890129A (en) * | 1987-12-14 | 1989-12-26 | Eastman Kodak Company | Exposure control device |
US5136558A (en) * | 1989-06-20 | 1992-08-04 | Applied Magnetics Corporation | Two axis electromagnetic actuator |
US5105297A (en) * | 1989-08-08 | 1992-04-14 | Eastman Kodak Company | Mount for an optical element |
US5532997A (en) * | 1990-06-06 | 1996-07-02 | Texas Instruments Incorporated | Optical tracking system |
US5448546A (en) * | 1990-06-06 | 1995-09-05 | Texas Instruments Incorporated | Optical storage media light beam positioning system |
US5491680A (en) * | 1990-06-06 | 1996-02-13 | Texas Instruments Incorporated | Optical tracking system for positioning a beam of light |
US5291473A (en) * | 1990-06-06 | 1994-03-01 | Texas Instruments Incorporated | Optical storage media light beam positioning system |
US20070165312A1 (en) * | 2004-07-30 | 2007-07-19 | Sony Corporation | Deformable mirror device, deformable mirror plate |
US7874688B2 (en) * | 2004-07-30 | 2011-01-25 | Sony Corporation | Deformable mirror device, deformable mirror plate |
CN110244429A (en) * | 2019-06-01 | 2019-09-17 | 瑞声科技(新加坡)有限公司 | A kind of prism apparatus and periscope type lens mould group applied to periscope type lens mould group |
CN110244429B (en) * | 2019-06-01 | 2021-12-21 | 瑞声光学解决方案私人有限公司 | Be applied to prism device and periscopic lens module of periscopic lens module |
CN110275271A (en) * | 2019-07-15 | 2019-09-24 | 北京遥感设备研究所 | A kind of connection structure of reflecting mirror and shaft |
CN110275271B (en) * | 2019-07-15 | 2021-09-14 | 北京遥感设备研究所 | Connecting structure of reflector and rotating shaft |
Also Published As
Publication number | Publication date |
---|---|
NO763341L (en) | 1977-04-05 |
AU1831376A (en) | 1978-04-06 |
CH611719A5 (en) | 1979-06-15 |
FR2326716A1 (en) | 1977-04-29 |
AU496933B2 (en) | 1978-11-09 |
ATA730676A (en) | 1978-03-15 |
SE7610811L (en) | 1977-04-04 |
SE407295B (en) | 1979-03-19 |
GB1558810A (en) | 1980-01-09 |
DK441076A (en) | 1977-04-04 |
DK140194B (en) | 1979-07-02 |
DK140194C (en) | 1979-11-26 |
DE2643581A1 (en) | 1977-04-07 |
IT1072943B (en) | 1985-04-13 |
NL7511634A (en) | 1977-04-05 |
ES452034A1 (en) | 1977-10-01 |
AT346405B (en) | 1978-11-10 |
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